package com.websocket.demo.config;

import com.google.common.base.Splitter;
import com.google.gson.Gson;
import com.websocket.demo.model.RedisMessageModel;
import lombok.extern.slf4j.Slf4j;
import org.joda.time.DateTime;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;

import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.List;
import java.util.concurrent.CopyOnWriteArraySet;

@ServerEndpoint("/websocket/{userid}")
@Component
@Slf4j
public class WebSocketServer {

    //静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。
    private static int onlineCount = 0;
    //concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
    private static CopyOnWriteArraySet<WebSocketServer> webSocketSet = new CopyOnWriteArraySet<WebSocketServer>();
    //与某个客户端的连接会话，需要通过它来给客户端发送数据
    private Session session;
    //接收userid
    private String userid = "";

    /**
     * 连接建立成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session, @PathParam("userid") String userid) {
        this.session = session;
        webSocketSet.add(this);
        //加入set中
        addOnlineCount();
        //在线数加1
        log.info("有新窗口开始监听:" + userid + ",当前在线人数为" + getOnlineCount());
        this.userid = userid;
        try {
            sendMessage("连接成功");
        } catch (IOException e) {
            log.error("websocket IO异常");
        }
    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        webSocketSet.remove(this);
        //从set中删除
        subOnlineCount();
        //在线数减1
        log.info("有一连接关闭！当前在线人数为" + getOnlineCount());
    }

    /**
     * 收到客户端消息后调用的方法 * * @param message 客户端发送过来的消息
     */
    @OnMessage
    public void onMessage(String message, Session session) {
        log.info("收到来自窗口" + userid + "的信息:" + message);
        //群发消息
        for (WebSocketServer item : webSocketSet) {
            try {
                item.sendMessage(message);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * * @param session * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {
        log.error("发生错误");
        error.printStackTrace();
    }

    /**
     * 实现服务器主动推送
     */
    public void sendMessage(String message) throws IOException {
        this.session.getBasicRemote().sendText(message);
    }

    /**
     * 群发自定义消息 *
     */
    public static void sendInfo(String title,String message, @PathParam("userid") String userid) throws IOException {
        log.info("推送消息到窗口" + userid + "，推送内容:" + message);
        List<String> userids = null;
        if (StringUtils.hasLength(userid)) {
            Splitter splitter = Splitter.on(',');
            userids = splitter.splitToList(userid);
        }
        String sys_time = new DateTime().toString("yyyy-MM-dd HH:mm");
        RedisMessageModel messageModel = new RedisMessageModel();
        messageModel.setTitle(title);
        messageModel.setContent(message);
        messageModel.setCreate_time(sys_time);
        message = new Gson().toJson(messageModel);
        for (WebSocketServer item : webSocketSet) {
            try {
                //这里可以设定只推送给这个userid的，为null则全部推送
                //利用redis  缓存未在线用户的消息,封装未json格式数据
                if (userids != null && !userids.isEmpty()) {
                    for(int i = userids.size()-1;i >= 0;i--){
                        if (item.userid.equals(userids.get(i))){
                            item.sendMessage(message);
                            userids.remove(i);
                        }
                    }
                } else {
                    //给所有人发送
                    item.sendMessage(message);
                }
            } catch (IOException e) {
                continue;
            }
        }

        //对剩余未发送用户缓存在redis
        if(userids != null && !userids.isEmpty()){

        }
    }

    public static synchronized int getOnlineCount() {
        return onlineCount;
    }

    public static synchronized void addOnlineCount() {
        WebSocketServer.onlineCount++;
    }

    public static synchronized void subOnlineCount() {
        WebSocketServer.onlineCount--;
    }


}
